Hot-aie



ERNST & SHEPARD.

Hot Air Furnace.

Patented July 17,4860.

UNITED SS rice.

ADAM ERNST AND G. SHEPARD, OF MILWAUKEE, WISCONSIN.

HOT-AIR FURNACE.

To all whom it may concern:

Be it known that we, A. ERNST and C. SHEPARD, of the city of Milwaukee, in the State of Wisconsin, have invented a new and Improved Hot-Air Furnace; and we do hereby declare that the following is afull, clear, and exact description of the construction and operation of the same.

To enable others skilled in the art to make and use our invention we will proceed to describe it, reference being had to the accompanying drawings and to the letters of reference marked thereon.

Figure 1, represents a perspective view of the furnace; and Fig. 2, a section through the end of one of the hot air pipes of the furnace.

The furnace consists of a cylinder A, of the usual construction for the reception of the fuel, and a system of pipes or fiues B C D E F G H I J K L, through which the heated air and products of the combustion of the fuel in cylinder A, can be caused to pass before they enter the chimney at M. The upper system of flues O D E K L, and the lower one G H I, are connected by verticOal fiues J, F, and two vertical brace rods The whole furnace is surrounded by brickwork and suitable flues lead from the space within the brickwork and around the furnace, to the apartments to be supplied with hot air.

One end of each of the horizontal fiues C, E, L, K, I, H, G, is closed with a cover W, V, and passes through a hole in the inner face T, of a collar S. The diameter of this hole corresponds to the outer diameter of the flue while the inner diameter of the collar is somewhat larger than the outer diameter of the flue and the inner surface of the cover R, with which the collar is closed, is also at some distance from the outer surface of the cover W', so that there shall be a space between the end of the flue and the surrounding collar S, and cover R U, as represented in Fig. 2. Both covers it will be seen, are provided with cylindrical collars U, and V, to fit into the outer ends of collar S, and of the flue respectively.

The brickwork consists of double walls Z, Z, as seen in Fig. 2. The cold air is caused to circulate through the open space Y, between the two walls Z, Z, before it enters the space within the brick work and around the furnace for the purpose of being heated.

The collars S, are set in the brickwork as seen in Fig. 2-, in such a manner that the covers R U, and WV V, can be removed from the outside whenever it becomes necessary to clean the horizontal fiues. By this arrangement the cleaning of these flues can be done from the outside.

The collars S, and covers R U, and the space between them and the ends of the flues and covers IV, serve to protect the ends of the fines from the effects of the cold air in the space Y, between the double walls, and of the cold air outside of the brickwork; which could not be done if the ends of the fiues were set in the brick work without collars S, and covers R. Another advantage of this arrangement is that the flues are free to expand and contract according to the changes of temperature, as their ends slide freely in the holes in the inner faces T, of the collars S.

YVhen the damper P, is closed the hot air and products of the combustion pass through B, C, D, into the forward end of flue E, down through F, into G, and through H, I, J, K, L, to wit through the whole system of fines, before they enter the chimney at M.

Then it should become desirable to lower the temperature around the furnace the damper P, may be opened when the hot air and products of combustion will pass through B, C, D, and through the rear portion of flue E, immediately into flue L, and out into the chimney at M.

Having described our invention what we claim therein as new and desire to secure by Letters Patent is:

Combining the fines of a furnace surrounded with double walls, with collars S, and covers R U, W V, substantially as and for the purposes described.

ADAM ERNST. C. SHEPARD.

Witnesses:

F. J. MCKENZIE, H. HOCKEMEYER. 

